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3 years ago

Why is it important that a football defender should have a lot of mass

Physics

1 answer:

mihalych1998 [28]3 years ago

5 0

It is important that a football defender should have a lot of mass because of Defenders are aggressive .

They aren't afraid to make strong tackles and use their body.

They attack balls with their heads and get in front of shots.

Play so aggressive that players are scared to receive the ball.

• The role of the first defender is further broken down into four steps :- Approach , Delay , Control and Tackle ..

<h3>Hope this helps you :) ..</h3>

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lesya [120]

by energy conservation we know that

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now we have

$\frac{1}{2}I\omega^2 + \frac{1}{2}mv^2 = mgH$

also we know that

$v = R\omega$

now we have

$\frac{1}{2}(\frac{1}{2}mR^2)\omega^2 + \frac{1}{2}m(R\omega)^2 = mgH$

$\frac{3}{4}mR^2\omega^2 = mgH$

$\omega = \sqrt{\frac{4gH}{3}}/R$

now when it is rolling on ground the torque acting on it due to friction force is given by

$\tau = R F_f$

$\tau = \mu mg R$

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$\alpha = \frac{2 \mu g}{R}$

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$\omega = \omega_i + \alpha t$

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4 years ago

What part do tiny, solid particles in the atmosphere play in cloud formation?

Margarita [4]

Well,

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4 years ago

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Sveta_85 [38]

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3 years ago

Water at 20°C flows by gravity through a smooth pipe from one reservoir to a lower one. The elevation difference is 60 m. The pi

Serga [27]

Answer:

Flow Rate = 80 m^3 /hours (Rounded to the nearest whole number)

Explanation:

Given

Hf = head loss
f = friction factor
L = Length of the pipe = 360 m
V = Flow velocity, m/s
D = Pipe diameter = 0.12 m
g = Gravitational acceleration, m/s^2
Re = Reynolds's Number
rho = Density =998 kg/m^3
μ = Viscosity = 0.001 kg/m-s
Z = Elevation Difference = 60 m

Calculations

Moody friction loss in the pipe = Hf = (f*L*V^2)/(2*D*g)

The energy equation for this system will be,

Hp = Z + Hf

The other three equations to solve the above equations are:

Re = (rho*V*D)/ μ

Flow Rate, Q = V*(pi/4)*D^2

Power = 15000 W = rho*g*Q*Hp

1/f^0.5 = 2*log ((Re*f^0.5)/2.51)

We can iterate the 5 equations to find f and solve them to find the values of:

Re = 235000

f = 0.015

V = 1.97 m/s

And use them to find the flow rate,

Q = V*(pi/4)*D^2

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3 years ago

A meteorologist plans to release a weather balloon from ground level, to be used for high-altitude atmospheric measurements. The

Slav-nsk [51]

Answer:

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So, F = ρgV = ρg4πr³/3

substituting the values of the variables into the equation, we have

F = 1.29 kg/m³ × 9.8 m/s² × 4π × (2.20 m)³/3

= 1691.58 N/3

= 563.86 N

8 0

3 years ago

Why is it important that a football defender should have a lot of mass​

Why is it important that a football defender should have a lot of mass